title: Astigmatism correction with toric IOL: analysis of visual performance, position, and wavefront error.
abstract: OBJECTIVE
  To evaluate astigmatism correction, visual performance, intraocular lens (IOL) position, and wavefront error after implantation of toric IOLs in patients with cataract.
  
  
  METHODS
  This prospective study comprised 30 eyes of 30 patients with cataract who were candidates for phacoemulsification and implantation of the AcrySof toric IOL (Alcon Laboratories, Inc., Fort Worth, TX). Mean preoperative corneal keratometric and subjective refractive cylinder were 2.10 ± 0.47 and 2.17 ± 0.41 diopters (D), respectively.
  
  
  RESULTS
  The refractive cylinder decreased significantly from 2.17 ± 0.41 to 0.73 ± 0.45 D (P = .001) at 180 days postoperatively. The difference between preoperative corneal astigmatism and postoperative refractive astigmatism was statistically significant (P < .05). At 180 days postoperatively, the uncorrected distance visual acuity was 0.20 logMAR (Snellen 20/32) in 100% of patients and 0.0 logMAR (Snellen 20/20) in 64% of patients. The root mean square of internal coma and trefoil aberrations showed a trend toward reduction; internal spherical aberration significantly decreased, whereas corneal trefoil aberration significantly increased (P < .05). A low amount of IOL decentration and tilt were detected at 30 and 180 days postoperatively, respectively.
  
  
  CONCLUSIONS
  Toric IOL implantation is an effective procedure for correction of preexisting corneal astigmatism, improving visual performance, and inducing a low amount of higher-order aberrations. Moreover, the toric IOLs is well positioned early after surgery and stable over time.
authors.affiliation: Department of Medicine and Science of Ageing Eye Clinic, G. d' Annunzio University Chieti-Pescara, Chieti-Pescara, Italy. totolisa@hotmail.com
authors.forename: Lisa
authors.initials: L
authors.lastname: Toto
authors.forename: Luca
authors.initials: L
authors.lastname: Vecchiarino
authors.forename: Erminia
authors.initials: E
authors.lastname: D'Ugo
authors.forename: Daniela
authors.initials: D
authors.lastname: Cardone
authors.forename: Alessandra
authors.initials: A
authors.lastname: Mastropasqua
authors.forename: Rodolfo
authors.initials: R
authors.lastname: Mastropasqua
authors.forename: Marta
authors.initials: M
authors.lastname: Di Nicola
mesh_terms: D000368:Aged; D001251:Astigmatism / Q000503:physiopathology / Q000601:surgery*; D019781:Corneal Topography; D057108:Corneal Wavefront Aberration / Q000503:physiopathology*; D006801:Humans; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008875:Middle Aged; D018918:Phacoemulsification; D011446:Prospective Studies; D012029:Refraction, Ocular / Q000502:physiology; D016896:Treatment Outcome; D014792:Visual Acuity / Q000502:physiology*